Becoming a pilot involves much more than learning to fly an aircraft. Alongside practical flight training, student pilots study aviation theory to understand how aircraft operate, how to navigate safely, how weather affects flying, and how to make sound decisions in the air.
In Australia, the Civil Aviation Safety Authority (CASA) sets the theory examination requirements for pilots working towards a Commercial Pilot Licence (CPL). If you are planning to become a commercial pilot, here is an overview of the subjects you will study and what you need to know about the exams.
The CASA Commercial Pilot Licence Theory Subjects
For a Commercial Pilot Licence (Aeroplane), students study seven core theory subjects. These cover general aviation knowledge as well as topics specific to operating aeroplanes.
1.Human Factors (CHUF)
Human Factors looks at how the human body and mind affect flight safety. You will learn about aviation physiology, spatial awareness, decision-making, stress management and crew resource management.
Understanding these factors helps pilots recognise their limitations, manage workload and make safe decisions, particularly when conditions become challenging.
2. Navigation (CNAV)
Navigation teaches you how to plan and conduct flights safely from one location to another. Topics include reading aviation charts, flight planning, calculating headings and flight times, using navigation systems, and meeting tracking requirements.
These skills are essential for cross-country flying and for navigating accurately in different conditions.
3. Meteorology (CMET)
Weather plays a major role in aviation, so pilots need to understand how it develops and changes. Meteorology covers weather patterns, pressure systems, cloud formations, wind, visibility and forecasts.
You will also learn to interpret aviation weather reports, including METARs and TAFs, to assess whether conditions are suitable for a flight.
4. Flight Rules and Air Law (CLWA)
Pilots must understand the laws and procedures governing aviation in Australia. This subject covers airspace classifications, flight rules, right-of-way requirements, operational procedures, pilot responsibilities and relevant aviation regulations.
Air Law is particularly important because pilots are responsible for operating within legal requirements and maintaining safe separation from other aircraft.
5. Aircraft General Knowledge (CSYA)
This subject explains how an aeroplane works. You will study aircraft structures, engines, fuel and electrical systems, flight instruments and other essential aircraft components.
The aim is to understand how these systems operate, recognise abnormal situations and appreciate how aircraft design and systems affect flight safety.
6. Aerodynamics (CADA)
Aerodynamics explores the principles that allow an aeroplane to fly. You will study lift, drag, thrust, weight, stability and aircraft control.
You will also learn how factors such as airspeed, angle of attack, aircraft configuration and loading affect flight performance and handling.
7. Performance and Loading (CFPA)
Pilots must know whether an aircraft can safely complete a planned flight. This subject covers take-off and landing performance, weight and balance calculations, fuel planning and aircraft performance under different operating conditions.
These calculations help pilots determine whether an aircraft can operate safely within its approved limits.
What Pass Marks Do You Need at CPL Level?
CASA sets minimum pass marks for each theory examination. Most of the CPL aeroplane theory exams require a score of at least 70%, but Flight Rules and Air Law has a higher requirement.
| CASA exam | Subject | Minimum pass mark |
| CHUF | Human Factors | 70% |
| CNAV | Navigation | 70% |
| CMET | Meteorology | 70% |
| CLWA | Flight Rules and Air Law | 80% |
| CSYA | Aircraft General Knowledge | 70% |
| CADA | Aerodynamics | 70% |
| CFPA | Performance and Loading | 70% |
These are individual examinations, so students need to meet the required pass mark in each subject rather than relying on an overall average.
The theory component requires consistent study and preparation. Some subjects involve memorising regulations and procedures, while others require calculations, interpreting charts and applying knowledge to realistic flight scenarios.
What Is the IREX Exam?
For pilots who want to progress towards flying under Instrument Flight Rules (IFR), another important examination is the Instrument Rating Examination (IREX).
While the CPL theory subjects establish the knowledge needed to operate as a commercial pilot, IREX focuses on the additional knowledge required for instrument flying.
This includes instrument flight planning, IFR procedures, instrument approaches, navigation aids, alternate aerodrome requirements, fuel planning and the interpretation of weather and operational information relevant to instrument flights.
The IREX exam has a minimum pass mark of 70%. Passing the theory examination is one part of the process: pilots must also complete the required instrument flight training and satisfy the applicable flight test and licensing requirements to obtain an Instrument Rating.
An Instrument Rating can open up additional career opportunities by enabling suitably qualified pilots to operate in accordance with instrument flight privileges, subject to the applicable licence, rating and operational requirements.
How Does Theory Study Fit Into Flight Training?
Theory and practical flying are closely connected. What you learn in the classroom helps you understand the decisions you make in the cockpit.
For example, meteorology helps you assess changing weather conditions, navigation supports cross-country flight planning, and aerodynamics explains how an aircraft responds to control inputs. Performance calculations help you determine whether a planned take-off or landing can be completed safely.
As you progress through flight training, you will apply this knowledge during briefings, practical exercises and increasingly complex flights.
Students should expect to dedicate regular time to theory study alongside their flying lessons. Developing a strong understanding of the subjects early makes it easier to apply that knowledge in the air and prepare for CASA examinations.
Start Your Pilot Training Journey
Becoming a commercial pilot requires commitment, discipline and a willingness to learn. However, you do not need to arrive with an aviation background. The theory subjects are designed to develop your knowledge progressively as you build your practical flying skills.
At the Australian National Airline College, students working towards a Commercial Pilot Licence develop the theoretical knowledge and practical skills needed to progress towards a professional aviation career.
If you are considering becoming a pilot, understanding the subjects involved is a useful first step towards knowing what to expect from your training.
Ready to explore your options? Learn more about our Diploma of Aviation (Commercial Pilot Licence) and the pathway towards a career in aviation.